Emu XL-7 & MP-7 User's Group

I've had my XL-7 for a few months and I love it. When I got it, the
data wheel had the same problems as I've heard a couple of other
people reporting. I've mostly dealt with it but now that I'm using it
a lot more, this problem is REALLY slowing me down.

I've already taken off the case and sprayed contact cleaner at the
points indicated in another message somewhere, to no avail.

Is there anything else I can do, or is there someone that can fix it?